package offer;

public class Offer09 {
    public int fib(int n) {
        if(n<=1){
            return n;
        }
        int[] dp=new int[n+1];
        dp[0]=0;
        dp[1]=1;
        for(int i=2;i<=n;i++){
            dp[i]=dp[i-1]+dp[i-2];
        }

        return dp[n];
    }


    public static void main(String[] args) {
        Offer09 offer09 = new Offer09();
        System.out.println(offer09.fib(45));
    }
}
